On the occasion of Dieter Spreen's 75th birthday there will be a Festschrift in the Journal of Logic and Analysis. I have submitted a paper “Spreen spaces and the synthetic Kreisel-Lacombe-Shoenfield-Tseitin theorem”, available as a preprint arXiv:2307.07830, that develops a constructive account of Dieter's generalization of a famous theorem about continuity of computable functions. In this post I explain how the paper fits into the more general topic of continuity principles.