  How small can a set be while containing many configurations? Following up on
earlier work of Erd\H os and Kakutani \cite{MR0089886}, M\'ath\'e
\cite{MR2822418} and Molter and Yavicoli \cite{Molter}, we address the question
in two directions. On one hand, if a subset of the real numbers contains an
affine copy of all bounded decreasing sequences, then we show that such subset
must be somewhere dense. On the other hand, given a collection of convergent
sequences with prescribed decay, there is a closed and nowhere dense subset of
the reals that contains an affine copy of every sequence in that collection.
