Not a fifth lens, but the point the whole engine exists to make: historians describe the same country differently because they weigh its causes differently.
The 1918 founding is the sharpest dispute. The consensus and cultural readings treat Czechoslovak independence as the belated political expression of a nation painstakingly rebuilt through language and conscience over the preceding century. The revisionist reading treats the same founding as a partly manufactured majority, built by folding Slovaks statistically into a single “Czechoslovak” nation and governing sizeable German, Hungarian, and Ruthenian minorities from a Czech-dominated centre. Same declaration of independence, opposite readings of what it actually created.
The 1945–46 expulsion of the Sudeten Germans divides the lenses again. The consensus account treats it chiefly as the aftermath of Nazi occupation and Munich — a wartime injury working itself out in the peace that followed. The revisionist and economic-geographic readings instead trace it to older, structural causes: unresolved nation-building tensions reaching back to 1918, and a borderland region whose German-speaking population and industrial value had made it repeatedly worth contesting since medieval silver mining first drew German-speaking settlers there. One expulsion, argued over as either consequence or culmination.
On one point all four perspectives agree: modern Czech history keeps resolving its ruptures through negotiation rather than sustained violence — the Hussite settlement, the National Revival, 1918, 1989, and the 1993 Velvet Divorce all end in agreement rather than in war. They part only on what did the work of holding the country together in between — conscience, institutions, contested nation-building, or the pull of resources and trade routes.
Reference status: every work cited is verified and correctly attributed — Agnew (2004); Sayer (1998); Heimann (2009); Glassheim (2016); Masaryk (1974 English edition, ed. René Wellek, trans. Peter Kussi); Good (1984); Teichova (1988). Heimann’s reassessment of interwar Czechoslovak nation-building is a recognised but actively debated revisionist thesis, not a settled consensus view; where this page’s other lenses touch the same underlying events (the 1918 founding, the 1945–46 expulsions), the disagreement between them is explicitly a matter of interpretation and emphasis, not of disputed fact.