diorama inspired by a photo found on the internet depicting the elephant-shaped slide

... 2120 of the things that handed down to me I found a diary dated September 1982, with the writing "Secret places - property of Матвей (Matvey)"
there are drawings and annotations with elementary handwriting, one drawing in particular attracts my attention, it is the map of the city dotted with red Xs, so far I have found two components in the X called "childhood place"!
the research continues ...